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3 years ago

What us the definition of half-life?

1 answer:

7 0

Half-life is the time required for the amount of something to fall to half its initial value. This term is usually used in nuclear physics to describe how quickly unstable atoms undergo decay, or how long stable atoms survive, radioactive decay, and it is also used more generally of any type of exponential or non-exponential decay.

In simpler terms: this is when an isotopes radioactivity is cut in half

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Which of the following compounds are polar: CH2Cl2, HBr?

Olegator [25]

Answer : HBr polar

please add me to brainalist

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3 years ago

The theory of plate tectonics states that the earths surface is made up of moving ________

andriy [413]

Answer:

Plates

Explanation:

for example when 2 plates rub together that creates an earthquake a tsunami or even a mountain

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3 years ago

Why cant humans live off sunlight

Liula [17]

They will have no air and no energy or food. No food for animals, so animals die, and humans die with the lack of food, meat and plants

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3 years ago

How many nitrogen atoms are there in 2.10 moles of nitrogen moles?

Korolek [52]

N=N/Na;
N=n×Na

$N = 2.10 \times 6.02 \times {10}^{23} = 1.2642 \times {10}^{23} \: atoms$

$N(N2) = 2 \times 1.2642 \times {10}^{23} = 2.5284 \times {10}^{24} molecules$
answer: a

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3 years ago

Explain what a chemical reaction is and moles

Delvig [45]

Answer:

A process during which chemical bonds between atoms are broken and new ones are formed, producing one or more substances.

Moles are the amount of substance that contains as many particles.

Explanation:

A chemical reaction is when a chemical change occurs for example when a nail comes into contact with air and is then exposed to air it begins to rust. It forms a red-brown substance which changes the chemical composition of the original compound.

Examples of chemical reactions:

Combustion

Oxidation (rusting)

Cooking an egg

Photosynthesis

Digestion

Fireworks

Paper Burnin

The mole is the amount of substance that contains as many particles (molecules, ions or atoms) as there are in 12g of carbon.

1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12 and that number is referred to as Avogardo's constant (6.022 x $10^{23}$ ).

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2 years ago